Which statement describes an indication for therapeutic anticoagulation?

Which statement describes an indication for therapeutic anticoagulation?

• A. Prophylaxis for Afib
• B. DVT
• C. Prophylaxis after orthopedic surgery
• D. Prophylaxis for a mechanical heart valve

Answer: (B)

Therapeutic anticoagulation is used when there is an actual clot that needs to be treated, or a situation that requires full-dose anticoagulation to prevent serious events. A deep vein thrombosis is a diagnosed clot in the venous system, and once DVT is present you start therapeutic dosing to prevent clot propagation and a possible pulmonary embolism. That makes it a clear indication for therapeutic anticoagulation. The other statements describe prophylaxis—meant to prevent clots from forming rather than to treat a current clot. Prophylaxis after orthopedic surgery uses lower-dose, short-interval anticoagulation to reduce the risk of new clots in the perioperative period. Prophylaxis for atrial fibrillation refers to preventing stroke in a patient with AF, which is a preventive use rather than treatment of an existing thrombosis. Prophylaxis for a mechanical heart valve hints at prevention but in practice a mechanical valve requires ongoing therapeutic anticoagulation to prevent valve thrombosis; the phrasing here emphasizes prevention rather than treating an established clot, so it’s not the best description of a therapeutic indication. Thus, treating a known DVT with therapeutic anticoagulation is the best answer.

Therapeutic anticoagulation is used when there is an actual clot that needs to be treated, or a situation that requires full-dose anticoagulation to prevent serious events. A deep vein thrombosis is a diagnosed clot in the venous system, and once DVT is present you start therapeutic dosing to prevent clot propagation and a possible pulmonary embolism. That makes it a clear indication for therapeutic anticoagulation.

The other statements describe prophylaxis—meant to prevent clots from forming rather than to treat a current clot. Prophylaxis after orthopedic surgery uses lower-dose, short-interval anticoagulation to reduce the risk of new clots in the perioperative period. Prophylaxis for atrial fibrillation refers to preventing stroke in a patient with AF, which is a preventive use rather than treatment of an existing thrombosis. Prophylaxis for a mechanical heart valve hints at prevention but in practice a mechanical valve requires ongoing therapeutic anticoagulation to prevent valve thrombosis; the phrasing here emphasizes prevention rather than treating an established clot, so it’s not the best description of a therapeutic indication.

Thus, treating a known DVT with therapeutic anticoagulation is the best answer.